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Home >> Toyota >> 2009 >> Matrix S, AWD >> Repair and Diagnosis (Single Page) >> Transmission >> Transfer Case MF1A/4WD/AWD >> Active Torque Control 4WD System >> DTC U0073/86: Control Module Communication Bus OFF; DTC U0100/85: Lost Communication with ECM / PCM "A"; DTC U0129/83: Lost Communication with Brake System Control Module >> Inspection Procedure
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Inspection Procedure

  1. CHECK FOR DTC 
    1. Check for DTC (See DTC CHECK / CLEAR  ).
    2. Record the output DTC (4WD control system).

      HINT:

      When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor.

      NEXT: GO TO CAN COMMUNICATION SYSTEM  (See HOW TO PROCEED WITH TROUBLESHOOTING )

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